Motion conversion device



Sept. 15, 1964 M. VON RABENAU 3,143,452

MOTION CONVERSION DEVICE Filed April 30, 1962 a Sheets-Sheet 1 INVENTOR.MANUEL Vo/vAAsE/vAu Avg-waver:

Sept. 15, 1964 M. VON RABENAU 3,143,452

MOTION CONVERSION DEVICE Filed April 50, 1962 5 Sheets-Sheet 2 ITOR.MflNl/EL Va/vRABE/vw 14 T'TORNE KS Sept. 15, 1964 M. VON RABENAU3,148,452

MOTION CONVERSION DEVICE Filed April so, 1962 :5 Sheets-Sheet s IN VENTOR. Mmvua I a/VIMBENAU Arrow/vs):

United States Patent 3,148,452 MOTION CONVERSION DEVICE Manuel vonRabenau, St. Paul, Minn., assignor to Writing Toys Corporation, St.Paul, Minu a corporation of Minnesota Fiied Apr. 30, 1962, Ser. No.191,183 8 Claims. (Cl. 33-18) This invention relates to a motionconversion device by which rotary motion is utilized to impartpredetermined longitudinal and lateral or transverse movement to acarrier arm for the purpose of mechanically reproducing a predeterminedword or phrase or design or other inscribed indicia. Among applicationsof such a device are the installation in the body of a doll or similartoy whereby rotory motion may be utilized to impart a predeterminedlongitudinal and transverse movement to a carrier arm to enable the dollor toy to simulate drawing or Writing.

The present invention constitutes an improvement over the inventiondescribed and claimed in my prior Patents No. 2,895,258 and No.3,024,535.

The principal object of this invention is to provide a motion converteradapted to the use of interchangeable double track disc cams providedwith a neutral groove or channel for each of the tracks and which uponrotation impart a predetermined longitudinal and transverse motion to acarrier arm guided by the cam followers in the tracks of said cams.

It is another object of this invention to provide a mechanical writingdoll or similar toy having a motion conversion device installed in itsbody and adapted to the use of interchangeable double track disc camswhich upon rotation impart predetermined longitudinal and transversemovement to a carrier arm guided by followers in the tracks of said camsand transmitted through one of the arms of the doll or similar toy to ahand holding a stylus with which a predetermined written message ordrawn figure or design may be inscribed.

Other objects of the invention will become apparent as the descriptionproceeds.

To the accomplishment of the foregoing and related ends, this inventionthen comprises the features hereinafter fully described and particularlypointed out in the claims, the following description setting forth indetail certain illustrative embodiments of the invention, these beingindicative, however, of but a few of the various ways in which theprinciples of the invention may be employed.

' The invention is illustrated by the accompanying drawings in which thesame numerals refer to corresponding parts and in which:

FIGURE 1 is a top plan View of the motion conversion device according tothe present invention;

FIGURE 2 is a rear elevation, in section, of the device;

FIGURE 3 is a left side elevation, in section;

FIGURE 4 is a plan View of one form of double track disc cam havingneutral grooves; and

FIGURE 5 is a representation of a doll showing schematically the mannerin which the device according to the present invention may beincorporated into the body of a doll or similar toy to produce amechanical writing toy.

Referring now to the drawings, and particularly to FIGURES 1, 2 and 3,there is shown a box-like frame or housing in the form of a rigidcylindrical tube, indicated generally at 10. The cylindrical housing isdisposed so that its longitudinal axis normally extends generallyvertically. It is provided with a bottom wall member 11 suitablyattached thereto. A top plate, generally in the form of an open ring,indicated generally at 12, is dis- 3,148,452 Patented Sept. 15, 1964posed at the top of the cylindrical housing and suitably attachedthereto, as by means of screws or bolts.

The top plate 12 is disposed generally horizontally and includes twovertically extending spaced apart apertured slide brackets 14 and 15adapted to slidably support a right hand horizontal slide bar or rod 16.The top plate also includes a pair of vertically extending slidebrackets 17 and 18, each provided with an aperture and adapted toslidably support a left hand slide bar or rod 19. The rods 16 and 19 aresupported to as to be parallel, lying in a generally horizontal plane,and adapted to move together in straight line movement in that plane.

A vertically extending bracket 20 is secured to the right hand bar orrod 16 for movement therewith, and a corresponding vertically extendingleft hand bracket 21 is secured to the left hand sliding bar or rod 19for movement therewith. Bracket 20 is disposed on rod 16 betweenbrackets 14 and 15 and bracket 21 is secured to rod 19 between brackets17 and 18. Brackets 2i) and 21 are connected by a pair of spacedparallel horizontal bars or rods 22 and 23 so as to form with thesliding rods 16 and 19 a rigid transversely or laterally reciprocatingunit. The unit reciprocates transversely or laterally relative to theword being written. For example, the transverse or lateral reciprocationforms the vertical elements of the Word being written.

Rods or bars 22 and 23 lie in a generally horizontal plane spaced frombut parallel to the plane in which rods or bars 16 and 19 move. Forconvenience, rod 22 may be referred to as the front rod and rod 23 asthe rear rod. The rigid transversely reciprocating unit composed of rods16 and 19, brackets 20 and 21, and rods 22 and 23 is referred to as thetransverse or lateral motion carrier, and indicated generally by thenumeral 24.

Slidably supported on the front and rear rods 22 and 23 of thetransverse motion carrier 24 is a longitudinal motion carrier, indicatedgene ally at 25. The longitudinal motion carrier effects the generallylongitudinal elements of the word being written. The longitudinal motioncarrier 25 includes a carrier base 26, a right hand end member 27secured to the base and a left hand end member 28 secured to theopposite end of the base. The end members 27 and 28 are each providedwith guide ways through which rods 22 and 23 extend so that the entirecarrier 25 is slidably movable longitudinally along rods 22 and 23 formovement relative to the transverse carrier 24 while movabletransversely with the transverse carrier frame 24.

A relatively long curved rigid carrier arm 29 is pivotally mounted inthe right and left end members 27 and 28 of the longitudinal motioncarrier for longitudinal movement therewith. Arm 29 is secured formovement with the carrier 25 by means of a pair of sleeves or collars3t) and 31 held in place by means of pins 32 and 33, respectively. Thus,the arm 29 can pivot with respect to the carrier 25 and is movedlongitudinally with it. Carrier arm 29 carries a stylus 34 at its outerextremity. In some instances, the skeletal arm 29 extends through thearm of a doll. In other instances, if desired, the arm of the doll maybe molded from relatively rigid material, fitted with a stylus at itsfingertips and secured to a foreshortened skeletal carrier arm in thevicinity of the shoulder of the doll by means not shown, but which arewell within the skill of a doll maker.

Another arm 35 is secured to the housing 10 on the side opposite fromthe carrier arm 29. Arm 35 is desirably mounted for slight rotationalmovement. As shown, it is pivotally supported in a vertically upstandingbracket 36 and held against longitudinal movement by means of a pair ofretaining collars 37 and 38 held in place by means of pins 39 and 40,respectively. Rotational movements of arm 35 is limited by virtue of arigid pin or crank arm 41 extending from arm 35 and engaging a notchformed in the rear edge of bracket 36 by virtue of an infolded tab 42.

Arm 35 carries a planar pad 43 at its outer extremity. The ends of arms35 and 29 are so interrelated that the pad 43 lies under stylus 34 sothat during operation of the motion conversation device the stylus movesin contact with the surface of the pad. The pad 43 is desirablyremovably attached to the arm 35. Thus, the doll in which the unit isinstalled may also be used for ordinary play as any ordinary doll.

The arm locating means 41 and 42 are so associated that the arm 35 inits lowermost rotational position comes to stop at a position comparableto that which a person writing on a pad held in his hand would assume.The more freely rotating carrier arm 29 rests on the pad by force ofgravity or, if desired, by spring tension not shown. The skeletal formof arm 35 shown may extend through the normal molded arm of the doll inwhich the converter is used or, if desired, the entire arm 35 may bemolded rigid or semi-rigid material in the form of a dolls arm andattached to the housing at the shoulder for limited pivotal movement.Arm 35 need not be attached to the housing 10 but may simply be attachedto the shoulder of the body of the doll or similar toy.

Movement is imparted to the carrier 24 and 25 by means of a double trackdisc cam, indicated generally at 44. The double track disc cam 44 issupported on a to tatable turntable 45 supported within the upperportion of the housing immediately underlying the motion carriers. Theturntable 4-5 is provided with a central spindle 46 to center the camdisc and a key in the form of a pin 47 to insure rotation of the camdisc with the turntable. A toothed aperture 48 in the cam (FIGURE 4)engages the spindle and key.

The turntable 45 is supported on a vertical shaft %9 having an outwardlyextending flange 59 at its lower end. Shaft 49 in turn is supported on ahollow tubular drive shaft 51, being secured to rotate therewith.Tubular drive shaft 51 in turn fits telescopically over a drivenvertical shaft 52 which is journaled in a bushing 53 in the top wall 54of a gear housing, indicated generally at 55. As seen in FIGURE 2,tubular shaft 51 is provided with a longitudinal slot 56 and drivenshaft 52 is provided with a pin 57 adjacent its upper end which fits andmoves longitudinally in slot 56 and imparts rotation to the tubularshaft and to the turntable when the driven shaft is rotated.

Shaft 52 is driven by suitable power such as a spring motor or, asillustrated, a small electric motor 58 supported from the bottom surfaceof the bottom wall 59 of the gear housing 55. The drive shaft 69 ofmotor 58 is fitted with a spur gear 61.

The teeth of gear 61 mesh with the teeth of a larger spur gear 62journaled for rotation in a bushing 63 in the bottom wall 59 of the gearhousing on an axis aligned with the axis of the vertical turntableshaft. A smaller spur gear 64 is secured to gear 62 and rotates on thesame axis with it and at the same rate. Gear 64 in turn meshes withlarger gear 65 journaled in a bushing 66 in the bottom wall 59 of thegear housing for rotation on an axis parallel to the axis of theturntable shaft. Gear 65 in turn has a smaller gear 67 secured to it forrotation on the same axis and at the same speed. This smaller gear inturn meshes with a larger gear 68 journaled in the top of the gear 64for rotation on the same axis as that gear, but independently and at adifferent rate.

A smaller gear 69 is attached to gear 68 for rotation with it on thesame axis and at the same rate of speed. Gear 69 in turn meshes with alarger gear 70 journaled in the top of gear 67 and a bushing 71 in thetop wall 54 of the gear housing 55. A smaller gear 72 is secured to gear70 and rotates on the same axis and at the same rate as gear 70. Gears70 and 72 rotate on the same axis as gears 65 and 67, but independentlythereof and at different rates of speed. Gear 72 in turn meshes with alarger 4 gear 73 secured to the bottom of the turntable shaft 52 withinthe gear housing.

The bottom of the turntable shaft 52 is journaled in bushing 53 and alsoin the top of gear 69. Gears 73, 69, 68, 64 and 62 all rotate on thesame axis but gears 62 and 64 rotate independently at a rate greaterthan gears 68 and 69, which rotate at a rate greater than gear 73. Thus,the rate of rotation of the turntable shaft is reduced to such a ratethat movement of the stylus on the pad in response to rotation of thedisc cam simulates the writing rate of a child.

Where an electric motor is used as the driving force, it may be powered,for example, by a pair of flashlight batteries 74 and 75 housed inrecesses 76 and 77, respectively, in the housing 10. In a manner whichis well understood, the batteries are connected in series betweencontacts, one of which is connected directly to the motor through asuitable conductor wire and the other of which is connected to the motorthrough a suitable connector wire to a switch and another wire from theswitch to the motor, in a conventional manner. The bottom wall 59 of thegear housing 55 is supported from the top wall by means of a pluralityof legs or posts 78. The gear housing is supported from the bottom wall11 of the housing 10.

As best shown in FIGURE 4, the face of the disc cam is provided with anouter endless eccentric operating cam track 79 which governs movement ofthe transverse motion carrier 24 by means of a cam follower 89 which ismoved in response to the configuration of the outer cam track. The discis also provided with an inner endless eccentric operating cam track 81which controls movement of the longitudinal motion carrier 25 throughthe medium of a cam follower 82 which rests in the cam groove and ismoved in response to rotation of the cam disc.

In addition, the face of the cam disc is provided with a circular outerneutral groove or channel or track 83 which is in direct communicationwith outer operating track 79 and a circular inner neutral groove orchannel or track 84 which is in communication with the inner operatingcam track 81. Neutral track 83 is exterior of and surrounds the outeroperating cam track 79 and neutral track 84 is interior of andsurrounded by the inner operating cam track 81. Both of these latter camtracks are interior of the outer operating cam track 79.

The neutral tracks end at their points of intersection with theoperating cam tracks and the beginnings of the neutral tracks are spacedas closely as possible to the points where the connecting tracks to theoperating tracks depart from the circular path. As pointed out ingreater detail hereinafter, the function of the neutral tracks is toinsure that the word or description written on the pad by the stylus isbegun at its beginning regardless of the relative location of the camtracks and cam followers when cam discs are interchanged.

The outer periphery of disc cam 44 is also provided with one or moreedge earns 85 whose function, as described in greater detailhereinafter, is to lift the stylus from the pad at the end of the wordor on other occasions when it is customary to lift a writing stylus froma pad, such as between words, to dot an i or to cross a t, and the like.

Transverse movement is imparted to the carriers 24 and 25 and carrierarm 29 by means of cam follower 80, as follows. Housing top plate 12 isprovided with a bifurcated or slotted guide bracket 86 whose guideportion is horizontally disposed in a plane parallel to the planes ofmovement of the carriers. The slot in bracket 86 is disposed to extendin a transverse or lateral direction, that is, from front to back of thehousing and the dolls body. Bracket 86 extends inwardly from thecylindrical wall of housing 10. Cam follower is supported in the slottedbracket, being restrained against vertical movement and held within theconfines of the slot by means of suitable collars 87 secured to the camfollower and disposed on opposite faces of the slotted bracket.

A link member 88 extending from cam follower 80 to rear rod 23 of thetransverse motion carrier 24 operatively connects the transverse motioncarrier for movement in response to the cam follower moving in the trackof the disc cam. A coil spring 89 is connected between link member 88and a screw or pin 90 in the housing wall to urge the cam follower andthe lateral motion carrier to a neutral position when the disc cam isremoved for replacement. Since the lateral and longitudinal motioncarriers move together it will be apparent that the same transversemotion imparted to carrier 24 will likewise be imparted to thelongitudinal motion carrier 25, and through it to the stylus arm 29.

Longitudinal motion is imparted by the longitudinal motion carrier 25and stylus arm 29 by means of cam follower 82, as follows. A furtherbifurcated or slotted guide bracket 91 is supported from top plate 12.The slotted guide portion of bracket 91 lies in the same plane as theslotted portion of bracket 86, spaced from but parallel to the planes ofmovement of the transverse and longitudinal motion carriers. The guideslot in bracket 91 is disposed at a right angle to the guide slot ofbracket 86. Cam follower 82 is supported for movement in the slot ofbracket 91 by means of a pair of collars 92 secured to the cam followerand disposed against opposite faces of the slotted bracket.

As best seen in FIGURE 2, the upper end of cam follower 82 is positionedin a transverse slot 93 at the bottom of the longitudinal motion carrierto permit relative movement in a lateral direction between the camfollower 82 and the longitudinal motion carrier. Slot 93 is defined by aportion of the bottom edge of the right hand end member 27 of thelongitudinal motion carrier 25 and a bar 94 secured to the bottomsurface of the base 26 of the longitudinal motion carrier, such as bymeans of screws 95.

At the same time, the position of the upper end of the cam follower 82in the slot 93 forms a direct connection between the cam follower andthe longitudinal motion carrier for longitudinal movement along the bars22 and 23 of the lateral motion carrier. A coil spring 96 is provided tourge cam follower 82 into its neutral position when the disc cam isremoved from the turntable. One end of spring 96 is secured to thelongitudinal motion carrier 25, as by means of screw 97, and theopposite end of the spring is attached to the bracket 36 extendingupwardly from the top plate of the housing.

In order to facilitate removal and exchange of disc earns, the discsupporting turntable 45 is movably mounted on telescoping shafts 51 and52, as already described. In order to constantly urge the disc cam onthe turntable up into operative contact with the cam followers, a coilspring 98 is provided around the vertical shafts. The lower end of coilspring 98 bears against a washer 99 supported by means of a collar 100around drive shaft 52. Collar 100 is in turn held by means of a pin 101extending through the shaft. The opposite end of coil spring 93 bearsagainst the bottom surface of the flange 50 below the turntable shaft.

In order to facilitate lowering of the disc cam turntable to permit achange of cams there is provided a clevis member 102 whose arms extendaround the turntable shaft and its surrounding coil spring and one endof which is pivotally mounted at 103 in a pivot bracket 104 secured tothe inside front wall of the cylindrical housing 10. A pair ofhorizontally disposed pins 105 and 106 is provided at the oppositeoutside edges of the clevis 102. A collar 107 is provided around theturntable shaft 49 in contact with the top surface of flange 50. A pairof horizontal pins 108 and 109 is provided extending outwardly from theoutside edges of collar 107. A pair of pivotally attached links 110 and111 6 connects the clevis 102 with the collar 107 through the pins and108, and 106 and 109, respectively. The free end of clevis 102 oppositeto its pivotal mounting is provided with a handle member 112 which isdesirably pivotally attached at 113.

Upon exertion of downward pressure on handle 112 the clevis 102 moves onits pivot 103. The downward motion of clevis 102 is transmitted throughthe pivotally mounted links and 111 to the collar 107 on the uppersurface of the flange 50 of the turntable shaft 49 and moves theturntable downwardly against the pressure of coil spring 98. The tubularshaft 51 slides over the drive shaft 52 while pin 57 moves in slot 56.In this manner, the turntable may be lowered sufliciently to permitremoval of one disc cam and replacement with another. As soon as thedisc cam is lowered free from the cam followers 80 and 82, the camfollowers are returned to their neutral positions by virtue of coilsprings 89 and 96, respectively.

An opening 114 of substantial size is provided in the back of housing 10to permit interchange of disc cams. In order to further facilitate thisexchange, a locking slot or notch 115 is desirably provided in the backwall of the housing 10 to receive the clevis handle 112 and hold theclevis and the turntable in their lowered position. Upon exchange of thecam the handle 112 is released from its retaining notch 115 and theturntable assembly is forced upwardly by spring pressure to bring thedisc cams again into resilient operative contact with the cam followers80 and 82. Since the cam followers are in their neutral positions theywill engage the neutral cam tracks of the cam. The handle 112 is thendesirably turned on its pivot 113 out of the way into the housing sothat it does not protrude out of the back of the doll or similar toy inwhich the mechanism may be installed.

The cam followers will engage the neutral cam tracks irrespective of therelative positions of the disc cam and other element of the device.Thus, when rotation of the turntable is begun, as by flow of currentfrom the batteries to the electric motor, the cam followers will ride intheir rsepective neutral tracks to the point where the neutral tracksmerge with the operating tracks and then the scribing of the inscriptionby the stylus will begin at the actual beginning. Thus, in someinstances, the scribing of the inscription may begin almost immediatelyafter rotation of the turntable is begun. In other instances, almost acomplete revolution of the turntable may occur before the cam followersare moved into the operating tracks to begin the scribing of theinscription. In FIG- URE 4, the cam followers 80 and 82 are shown inposition at the approximate beginning of the inscription about a 16th ofa turn of the cam after the cam followers have left their respectiveneutral grooves. I I In order that the stylus may be lifted from the padat the end of a word and similar situations, edge cam 85 at theperiphery of the ,disc cam is provided. The position and the length ofthe edge cam or cams is coordinated with the operating tracks of the camto provide spacing in the written inscription, as needed. In order topermit the edge cam to lift the stylus an arm or lever, indicatedgenerally at 116, is provided. The lever 116 is pivotally mounted bymeans of a pin 117 in a bracket 118 on the upper surface of the basemember 26 of the longitudinal motion carrier 25 intermediate of the endwalls.

Lever 116 is of a length such that it extends out beyond the peripheryof the disc cam'so that its bottom surface may engage the edge cam. Itsinner end which is adjacent the pivot 117 is provided with a liftingmember 119 positioned to engage a rigid elongated pin or arm 120projecting out from the portion of carrier arm 29 which lies between theend walls of the longitudinal motion carrier. When the outer end oflever 116 is engaged by the edge cam, it is lifted on its pivot mountingand at the same time, lifts pin 119 to rotate the carrier arm and liftthe stylus from the pad.

The disc cam 44 is desirably double faced, that is, provided with camtracks on both of its surfaces. In this manner, the writing doll orother toy may be made to write a different word or inscribe a differentinscription merely by lowering the turntable and turning the disc camover.

The stylus 34 may be, for example, a pencil, a ball point pen or thelike, and the pad 43 may be simply a pad of paper supported bya'suitable rigid backing. In the preferred embodiment of the invention,however, the stylus is simply a dull nonmarking point and the pad is asocalled Magic Slate. As is well known, such a tablet or pad comprisesan opaque backing sheet having a waxy coating overlaid by a semi-opaqueor translucent sheet. This last sheet is also desirably covered by atough scratchresistant transparent film. As an inscription is formed bythe pressure of the stylus against the top surface of the pad, thesemi-opaque sheet is forced into intimate con tact with the waxy surfaceof the opaque backing. Because of the very slight tackiness of the waxycoating the semi-opaque sheet adheres to the opaque backing along theline where pressure was applied so that the opaque backing is visiblethrough the semi-opaque sheet at these points. The whole inscription iserased by merely lifting the translucent sheet from the backing andbreaking the temporary bond between it and the backing sheet.

Even though the stylus tip is desirably a fixed permanent part of thearm of the doll or toy, it is preferred to provide a removable extensionof the stylus in the form of a simulated writing instrument. This may bea simulated pen or pencil or quill or the like, which is insertable intoa socket or other opening formed in the hand of the doll. When it isdesired to use the doll or toy in ordinary play, the simulated writinginstrument is removed along with the pad.

In the operation of the device, rotary motion is imparted to theturntable from the motor means through the gear system and turntableshaft to rotate the disc cam on the turntable. Rotation of the camcauses lateral movement of the transverse motion carrier on its sliderods. This lateral motion is transmitted to the longitudinal motioncarrier which is supported and carried by the transverse motion carrier.Then, either independently or simultaneously. depending upon the word orinscription being written, the rotation of the disc cam impartslongitudinal motion to the longitudinal motion carrier. These separatelateral and longitudinal movements are combined in the carrier arm sothat the stylus is moved in a pattern incorporating both lateral andlongitudinal motion to inscribe the predetermined word or otherinscription dictated by the operating tracks of the disc cam. When theunit is installed in the body of a doll, as shown in FIGURE 5, or asimilar toy and the arms of the device are either the arms of the doll,or extend through the arms of a doll or similar toy, the doll or toysimulates the writing of a human.

It is apparent that many modifications and variations of this inventionas hereinbefore set forth may be made without departing from the spiritand scope thereof. The specific embodiments described are given by wayof example only and the invention is limited only by the terms of theappended claims.

I claim:

1. In a device for converting rotary motion to transverse andlongitudinal motion in a plane, said device comprising a supportingframe, a transverse motion carrier mounted for reciprocatory motion insaid frame, a longitudinal motion carrier mounted on said transversemotion carrier for transverse motion with said carrier and longitudinalmotion relative thereto, a double track disc cam, a cam followerdisposed in association with each of said cam tracks, a slotted guidemember for each of said cam followers, said slotted guide members beingsecured to said frame and spaced from the face of said disc cam, theslots in said guide members being disposed at right angles with respectto each other, means connecting one of said cam followers to saidtransverse motion carrier to impart transverse motion to said carrier,means connecting the other of said cam followers to said longitudinalmotion carrier to impart longitudinal motion thereto, and means forrotating said cam, the improvement which resides in the provision ofresiliently mounted support means for said cam to urge said cam intoresilient contact with said cam followers, comprising a turntable, atelescoping drive shaft for the turntable, means to cause thetelescoping elements of said drive shaft to rotate together andresilient spring means positioned to normally urge the telescopingelements of said drive shaft apart, means for moving said resilientsupport means against resilient pressure to move said cam away from saidcam followers and out of contact therewith, resilient means to move saidcam followers in their respective slotted guide members to a neutralposition upon movement of said cam out of contact with said camfollowers, and aperture means in said frame permitting insertion andremoval of disc cams.

2. A device according to claim 1 further characterized in that means areprovided to lock said resilient supporting means in position holdingsaid disc cam out of contact with said cam followers to permit removaland exchange of disc cams.

3. A device according to claim 1 further characterized in that a rigidcarrier arm having a stylus at its outer extremity is mounted formovement with said longitudinal motion carrier and a second rigid arm ismounted for cooperation with said carrier arm, said second arm having afiat pad at its outer extremity held in the plane of movement of saidstylus, whereby the stylus may be moved over the surface of said pad insimulation of writing.

4. A device according to claim 3 further characterized in that saidrigid arms are supported for limiting rotational movement relative tosaid longitudinal motion carrier and said supporting frame.

5. A device according to claim 1 further characterized in that said camdisc is provided with a pair of nonintersecting endless eccentricoperating cam tracks disposed about the center of said disc, one of saidtracks governing longitudinal movement of the longitudinal motioncarrier and the other of said tracks governing simultaneous transversemovement of the transverse motion carrier and longitudinal motioncarrier, and a pair of circular neutral cam tracks disposed about thecenter of the disc, each of said neutral cam tracks being spaced fromand in communication with one of said eccentric cam tracks.

6. A device according to claim 5 further characterized by the provisionof eccentric edge cam means on said cam disc, a lifter arm associatedwith said carrier arm, said lifter arm extending to the periphery ofsaid cam disc and being operative to lift said carrier arm and stylusfor limited rotational movement away from the surface of said cam uponengagement with said edge cam means.

7. A device according to claim 4 further characterized in that thedevice is housed in the hollow body of a doll, said first carrier armbeing coextensive with one of the arms of said doll and said stylusbeing supported by the hand of that arm, the second of said arms beingcoextensive with the other arm of said doll and said flat pad beingsupported by the hand of that arm.

8. A device according to claim 7 further characterized in that meanssimulating a writing instrument are removably attached to the hand ofthe arm of the doll supporting said stylus and said rigid fiat pad isremovably attached to the hand of said other arm.

No references cited.

1. IN A DEVICE FOR CONVERTING ROTARY MOTION TO TRANSVERSE ANDLONGITUDINAL MOTION IN A PLANE, SAID DEVICE COMPRISING A SUPPORTINGFRAME, A TRANSVERSE MOTION CARRIER MOUNTED FOR RECIPROCATORY MOTION INSAID FRAME, A LONGITUDINAL MOTION CARRIER MOUNTED ON SAID TRANSVERSEMOTION CARRIER FOR TRANSVERSE MOTION WITH SAID CARRIER AND LONGITUDINALMOTION RELATIVE THERETO, A DOUBLE TRACK DISC CAM, A CAM FOLLOWERDISPOSED IN ASSOCIATION WITH EACH OF SAID CAM TRACKS, A SLOTTED GUIDEMEMBER FOR EACH OF SAID CAM FOLLOWERS, SAID SLOTTED GUIDE MEMBERS BEINGSECURED TO SAID FRAME AND SPACED FROM THE FACE OF SAID DISC CAM, THESLOTS IN SAID GUIDE MEMBERS BEING DISPOSED AT RIGHT ANGLES WITH RESPECTTO EACH OTHER, MEANS CONNECTING ONE OF SAID CAM FOLLOWERS TO SAIDTRANSVERSE MOTION CARRIER TO IMPART TRANSVERSE MOTION TO SAID CARRIER,MEANS CONNECTING THE OTHER OF SAID CAM FOLLOWERS TO SAID LONGITUDINALMOTION CARRIER TO IMPART LONGITUDINAL MOTION THERETO, AND MEANS FORROTATING SAID CAM, THE IMPROVEMENT WHICH RESIDES IN THE PROVISION OFRESILIENTLY MOUNTED SUPPORT MEANS FOR SAID CAM TO URGE SAID CAM INTORESILIENT CONTACT WITH SAID CAM FOLLOWERS, COMPRISING A TURNTABLE, ATELESCOPING DRIVE SHAFT FOR THE TURNTABLE, MEANS TO CAUSE THETELESCOPING ELEMENTS OF SAID DRIVE SHAFT TO ROTATE TOGETHER ANDRESILIENT SPRING MEANS POSITIONED TO NORMALLY URGE THE TELE-